VOL. XII 



PROCEEDINGS OF THE NATIONAL MUSEUM. 325 



It has the presutural channel of some of fcbe pleurotomoid forms, 



htit there is no notch or fasciole. The soft parts are as usual ; the an- 

 imal possessed small pigmented eyes and the operculum offered no 

 peculiarities. I do not know any species which greatly resembles it. 



Genus PISANIA Bivona. 

 Pisania pasio Linne. 

 £his species was abundantly collected at theAbrolhos Islands, Brazil. 



Genus ENG-INA Gray. 

 Engina turbinella Kiener. 

 Collected at the Abrolhos Islands. 



Genus NASSARIA Link. 



Subgenus NASSARINA Dall. 



Nassarina columbellata Dall. 



Plate VI, Fig. 8. 



Vassarina columbellata Dall, Bull. Mus. Comp. Zool., xvin. p. 182, June, 1889. 



Shell pure, white, attenuated anteriorly, rather acutely conical behind, 

 with eight whorls. Nucleus two-wborled, polished, smooth, milk white, 

 rather large; spire flatly conical, with a conspicuous suture; upper 

 whorls with about five strong, close-set, equal threads, most conspicuous 

 in the interspaces between the numerous (on the last whorl eighteen) 

 flattened transverse ribs, which cross the whorls but stop short before 

 the sutures, giving a grooved aspect to the latter, which is increased 

 by the existence of a peripheral line or space, wider than any of the 

 others, between the two spirals nearest the periphery ; last whorl atten- 

 uated toward the long caual, but not constricted, as in N. Bnshii Dall; 

 aperture long, narrow, contracted, with an elevated continuous margin, 

 interrupted only by the canal, which is recurved near its termination ; 

 outer lip with four or five internal teeth; inner lip with five or six finer, 

 smaller ones ; whorls not rounded above. Maximum longitude of shell, 

 I-J.-f ; of last whorl, 8; of aperture, G; maximum latitude of shell, 4.f>""". 



Hab. — U. S. Fish Commission Station 2367, off Cape Catoche, Yuca- 

 tan, in 124 fathoms, sand. 



The upper whorls of this shell are flattened and sculptured much like 

 those of Columbella similis or translirata. The species of this group 

 seem to bear much the same sort of a relation to Nassaria proper as 

 Strombina does to the typical Columbella. 



